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Analysis of embryonic proteome modulation by GA and ABA from germinating rice seeds
Author(s) -
Kim Sun Tae,
Kang Sun Young,
Wang Yiming,
Kim Sang Gon,
Hwang Du Hyeon,
Kang Kyu Young
Publication year - 2008
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.200800183
Subject(s) - abscisic acid , endosperm , proteome , germination , gibberellic acid , embryo , proteomics , biology , oryza sativa , western blot , botany , microbiology and biotechnology , gene , biochemistry
The phytohormones gibberellic acid (GA) and abscisic acid (ABA) play essential and often antagonistic roles in regulating plant growth, development, and stress responses. Using a proteomics‐based approach, we examined the role of GA and ABA in the modulation of protein expression levels during seed germination. Rice seeds were treated with GA (200 μM), ABA (10 μM), ABA followed by GA, GA followed by ABA, and water as a control and then incubated for 3 days. The embryo was dissected from germinated seeds, and proteins were subjected to 2‐DE. Approximately, 665 total protein spots were resolved in the 2‐D gels. Among them, 16 proteins notably modulated by either GA or ABA were identified by MALDI‐TOF MS. Northern analyses demonstrated that expression patterns of 13 of these 16 genes were consistent with those of the proteome analysis. Further examination of two proteins, rice isoflavone resuctase (OsIFR) and rice PR10 (OsPR10), using Western blot and immunolocalization, revealed that both are specifically expressed in the embryo but not in the endosperm and are dramatically downregulated by ABA.